本篇我们便来学习如何通过socket读写TCP.

需要注意的是socket必须写在子线程中,不能在ui主线程中直接使用,所以我们这里创建了两个class:

MainActivity(主界面)、TcpThread(获取socket接收的数据)

由于代码有注释了,所以就不解释了.

1.gif效果如下

2.activity_main.xml如下所示:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <EditText android:id="@+id/et_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:hint="请填入要发送的内容" /> <Button android:id="@+id/btn_send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_below="@+id/et_text" android:text="发送" /> <TextView android:id="@+id/tv_recv" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/btn_send" android:minLines="20" android:hint="接收的内容" /></RelativeLayout>

3.MainActivity.java如下所示

package com.example.tcpdemo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity { TcpThread mt; TextView tv_recv; EditText et_text; //要发送的内容 Button btn_send; //定义一个handler public Handler mHandler = new Handler() { public void handleMessage(Message msg) { //打印服务器端发来的消息 System.out.println("read:"+msg.obj.toString()); tv_recv.append(msg.obj.toString()+"\r\n"); }; }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv_recv = (TextView)findViewById(R.id.tv_recv); et_text = (EditText)findViewById(R.id.et_text); mt = new TcpThread(); mt.setHandler(mHandler); //设置handler mt.setIp("10.10.10.104"); //设置服务器地址 mt.start(); //启动线程 btn_send = (Button)findViewById(R.id.btn_send); btn_send.setOnClickListener(new OnClickListener() { //向服务器端发送数据 public void onClick(View v) { if(!mt.write(et_text.getText().toString())) { Toast.makeText(getApplicationContext(), "发送失败", Toast.LENGTH_SHORT).show(); } } }); }}

4.TcpThread.java如下所示

package com.example.tcpdemo;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;import java.net.UnknownHostException;import android.os.Handler;import android.os.Message;public class TcpThread extends Thread { Handler mHandler=null; Socket socket = null; String ip = null; OutputStream outputStream = null; //输出流 InputStream inputStream=null; //接收流 //获取另一个线程的Handler public void setHandler( Handler handler){ mHandler = handler; } //设置服务器IP public void setIp(String ip){ this.ip = ip; } public void run(){ try { socket = new Socket(ip, 8080); //访问指定的ip地址:8080 } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } //获取输出流 try { outputStream = socket.getOutputStream(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try{ while (true) //读取服务器端发送来的数据 { final byte[] buffer = new byte[1024];//创建接收缓冲区 inputStream = socket.getInputStream(); final int len = inputStream.read(buffer);//数据读出来，并且返回数据的长度 if(len>0) { Message msg = mHandler.obtainMessage(); //设置发送的内容 msg.obj = new String(buffer,0,len); mHandler.sendMessage(msg); } } } catch (IOException e) { } } //向服务器端写入数据 public boolean write(String text){ boolean ret = true; try { outputStream.write(text.toString().getBytes()); } catch (IOException e) { ret = false; e.printStackTrace(); } return ret; }}

总结

以上所述是小编给大家介绍的Android实现TCP客户端支持读写操作，希望对大家有所帮助！